selenium - 无法在“文档"上执行“评估":字符串不是有效的 XPath 表达式 [英] selenium - Failed to execute 'evaluate' on 'Document': The string is not a valid XPath expression

问题描述

有以下页面.

http://remitly.com/us/en/

当您单击某个选择时，会出现一个包含国家/地区的列表.我尝试选择一个国家，例如哥伦比亚并单击它.但我收到一个错误.

<块引用>

语法错误:无法在文档"上执行评估":字符串'//span[contains(@class, 'md_countryName_fdxiah8' and text(),'Colombia')]' 不是有效的 XPath 表达式.

select = driver.find_element_by_class_name('f1wrnyr7')选择.click()国家 = driver.find_element_by_class_name('f1o6pohl')country = countries.find_element_by_xpath("//span[contains(@class, 'md_countryName_fdxiah8' and text(), 'Colombia')]")

解决方案

此错误信息...

语法错误:无法在文档"上执行评估":字符串 '//span[contains(@class, 'md_countryName_fdxiah8' and text(), 'Colombia')]' 不是有效的 XPath表达.

...暗示您使用的 XPath 不是有效的 XPath 表达式.

看来你很接近了.您可以使用以下任一定位器策略::>

• 使用 xpath 1:

  country = countries.find_element_by_xpath("//span[contains(@class, 'md_countryName_fdxiah8') and text()='Colombia']")

• 使用 xpath 2:

  country = countries.find_element_by_xpath("//span[contains(@class, 'md_countryName_fdxiah8') and contains(., 'Colombia')]")

<块引用>

在这里你可以找到关于语法错误:无法在文档"上执行评估":字符串//img[contains('1236548597')]"不是有效的 XPath 表达式

<小时>

更新

要克服元素不可见错误，您需要为 visibility_of_element_located() 引入 WebDriverWait 并且您可以使用以下任一定位器策略:

element = WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.XPATH, "//span[contains(@class, 'md_countryName_fdxiah8') and text()='Colombia']")))

There is the following page.

http://remitly.com/us/en/

When you click on a select, a list with countries appears. I try to select one country, for example, Colombia and click on it. But I get an error.

SyntaxError: Failed to execute 'evaluate' on 'Document': The string '//span[contains(@class, 'md_countryName_fdxiah8' and text(), 'Colombia')]' is not a valid XPath expression.

select = driver.find_element_by_class_name('f1wrnyr7')
select.click()
countries = driver.find_element_by_class_name('f1o6pohl')
country = countries.find_element_by_xpath("//span[contains(@class, 'md_countryName_fdxiah8' and text(), 'Colombia')]")

解决方案

This error message...

SyntaxError: Failed to execute 'evaluate' on 'Document': The string '//span[contains(@class, 'md_countryName_fdxiah8' and text(), 'Colombia')]' is not a valid XPath expression.

...implies that the XPath which you have used was not a valid XPath expression.

Seems you were pretty close. You can use either of the following Locator Strategies:

• Using xpath 1:

  country = countries.find_element_by_xpath("//span[contains(@class, 'md_countryName_fdxiah8') and text()='Colombia']")
  

• Using xpath 2:

  country = countries.find_element_by_xpath("//span[contains(@class, 'md_countryName_fdxiah8') and contains(., 'Colombia')]")
  

Here you can find a relevant discussion on SyntaxError: Failed to execute 'evaluate' on 'Document': The string '//img[contains('1236548597')]' is not a valid XPath expression

---

Update

To overcome the element not visible error you need to induce WebDriverWait for visibility_of_element_located() and you can use either of the following Locator Strategy:

element = WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.XPATH, "//span[contains(@class, 'md_countryName_fdxiah8') and text()='Colombia']")))

这篇关于selenium - 无法在“文档"上执行“评估":字符串不是有效的 XPath 表达式的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！